cubic function的用法和樣例：
例句
- Every function whose derivative is linear is a quadratic function.
任意一個(gè)導數為線(xiàn)性函數的函數都是二次函數。 - In our proposed method, both the objective function and the perfect reconstruction condition are expressed as a quadratic function of the prototype filter coefficient vector.
該方法中，目標函數和完全重構條件均被表示成為原型濾波器系數矢量的二次函數形式。
